Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.

1 files changed, 0 insertions, 42 deletions

diff --git a/lexers/asp.lua b/lexers/asp.lua
deleted file mode 100644
index dc1b0e9..0000000
--- a/lexers/asp.lua
+++ /dev/null
@@ -1,42 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- ASP LPeg lexer.
-
-local l = require('lexer')
-local token, word_match = l.token, l.word_match
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
-
-local M = {_NAME = 'asp'}
-
--- Embedded in HTML.
-local html = l.load('html')
-
--- Embedded VB.
-local vb = l.load('vb')
-local vb_start_rule = token('asp_tag', '<%' * P('=')^-1)
-local vb_end_rule = token('asp_tag', '%>')
-l.embed_lexer(html, vb, vb_start_rule, vb_end_rule)
-
--- Embedded VBScript.
-local vbs = l.load('vbscript')
-local script_element = word_match({'script'}, nil, html.case_insensitive_tags)
-local vbs_start_rule = #(P('<') * script_element * (P(function(input, index)
-  if input:find('^%s+language%s*=%s*(["\'])vbscript%1', index) or
-     input:find('^%s+type%s*=%s*(["\'])text/vbscript%1', index) then
-    return index
-  end
-end) + '>')) * html.embed_start_tag -- <script language="vbscript">
-local vbs_end_rule = #('</' * script_element * l.space^0 * '>') *
-                     html.embed_end_tag -- </script>
-l.embed_lexer(html, vbs, vbs_start_rule, vbs_end_rule)
-
-M._tokenstyles = {
-  asp_tag = l.STYLE_EMBEDDED
-}
-
-local _foldsymbols = html._foldsymbols
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '<%%'
-_foldsymbols._patterns[#_foldsymbols._patterns + 1] = '%%>'
-_foldsymbols.asp_tag = {['<%'] = 1, ['%>'] = -1}
-M._foldsymbols = _foldsymbols
-
-return M